Marking tubular articles.



M. SAUNDERS, MARKING TUBULAR Amma APPLICATION FILED OCT. 121915..

Eatente Aug. (i, 1918.

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En STATES `acren'sflfros M. sennnnneor McKEEsPoR/r, PENNSYLY`- i115-, SSionon To NATIONAL wenn, COMPANY, on PITTSBURGH, PENNsrLx'ranni, ceneona'ron ,or New JERSEY.

. MARKING meenten aerienne@ specification of Letters P at'en 'Patented Mig-lencia. y

- appenni@ mea unitaria,en@siaieeaeen To all whom 'it may concern.' f

Be it known that I, 'AUGUSTUS M. SAUN- nnns, a citizen of the United States, and resident of McKeespoit, in the county of Allegheny and State of Pennsylvania,v have` invented certain new and usefullhnprove- .ments in Marking Tubular Articles, of.

- 'whichfthe following is a specification.

` l My invention relates to means for identiy10l ying welded pipes, tubes, and similarrolled metall' products, has for its object the pro l vision of a mark or symbol orseries of marks for' symbols on the surfaces of the pipes or ,ether articles, which is always visible, ap-

la parently illegibile or meaningless, but 'actually-,clear and plainly 'recognizable when observed in a certain manner or rorn thepiepen angle, and consists 1n the rovieion on the surfaces of the rolled meta articles 20 o a series of disconnected, and discontinuous pro3ect1ons or depressions forming marks having the appearance of defects but jin reality forming a letter or series of letters or other symbols when 'examined at the fili propel` angle.

ln the manufacture 'of welded pipesand g'tubes it is frequently necessary, after the ypipes or tubes have `been shippedfrom thel y `placeormannfactureto a place of use, to fang g ietelecine where the pipewas made-lor at ".ftvliicli of a number of plants such ipes were menu faotnied. Itis also desirab e to have tiiesexmarigs applied to the pipes :ir-tubes so readily determined. Y

Referring now to the drawing part of thisspecifupation,` Figure-1 is a plan' l showing a section of welded pipe having a i517)y mark as applied thereton accordance with -i my invention-fey- J `f wayin.' makes tliefma'rk vmore clearly apparent-and @width thereof, that theyare seemingly' related and meaningless.- l3nt being actually to tliesnrlface of the pipe or tube;

vata. slight angle tothe axis of thejpipe, af

:aange me@ ingle ense more readilydecipherable. v

v 55 inthe accompanying drawings, the outer marksv 3;- which*7 "as showng. are arranged to form linessimulating'theletters N A T (an 60l abbreviation of;l* ational -When viewed from most directionsxandfom nearly all angles, these' mai-kedo notclearlypindicate ..1 lvthat they` forno theletters N A 1T. z

-When occasion demands'it can be readily 65 detemnined -whetlieiornot anyaone pipe f which is' laid in the groundbears the appl r. l cantsmark, by nncovering'a small--part of vthe length of the nerim pipe.; Uncovez'ring` a small .portion of the length reveals' they@ presence or absence of the ridges-or idepressio on the pipes Siu-rfaeeegj Willen;I theee marks are present the 'relative location of but a few of them tells anyone familial' y with the niark thatit is .one ofthe app'li- S75 cants pipes, while the absence of the marks clearly indicates that the pipe is not of ap4 -v plicants manufacture; That the pipe is one;

cf applicants is proved by uncovering sufiii -cient of the length of the pipe to show the Y y.complete mark, 1

lt i's because the ,so-formed marks or nterrupticns in `the smoothmurface of the .pipeare separated and discontinuous and-ff; ofl a --length materiallyfgreater than'itheiif 35 width, and becausetlie serieeio marksare' pre-arranged in a definite relative klo :ati'on te. marke 'do forni legible-"eymbols-;when,1

viewed, from the-.proper angle withiiespefc' When-viewed from neiend-fof tlieipip illustratedin Fig. 2,',the Series of broken. llnes and perspective are shortened so .that

. the length of -theinarkfandof theletters* :Q l; gformedby the marks is 'more nearly equal; `to the width theveoL/andqfthe linesfinerge one intoanother so as. to show-*the lettere N A I in ,la clear andi-.unmistakablemanner" fra pil' rcf.lille-fmai-irs tothe ,i

. frein the provision of erebly are provided 'with depressions into which the met-el ol' the pipes or. -t-ubes is rolled during thewelding operation, und in this Wiz-y raised projections are provided on the outer surfece'of the pipe7 as is shown in Fig. l. i

As the eireuii i erence of the welding roll is considerably less than the length of the pipes und tubes as Welded, the meuk will be rolled on euch pipe et two,` three, or more pieces .in the length of the pipe, so that the marks or part of the marks will appear on pieces of the pipes and tubes no metter how short the pieces into vhieh they are cut.

' The etlventeges of my invention arise a' merk which is not readily distinguishable but which when the significance o' the niark is known is` 1-eadily observed :intl clearly recognizable.

Modifications in the Construction and 1rrangenient of the mark and of the parts forming the niark; may `be made Without de- The letters be rolled in the surinvention. the marl; may

panting 'from 'inf terming- "face of the flee instead of orininff rojeetions as shown, and other changes may rolled metal product connected projections be inside Within the scope of the appended claims.

l elain'u- -v l. As a 'new article 'of manufacture u.

connected interruptions in the continuity of the otherwise smooth surface of the product, said interruptions seemingly being unrelated and meaningless but actually having e relative location arranged' to form known .and legible symbols when viewed from the propen Aangle'relative to the niurked'surfece. l Y

2. As a nen7 article of manufacture, it welded pipe or tube having e series ofxlison the otherwise smooth outer surface of the pipe or tube, seid projections seen'iingly being unrelated but actually having n. relative location lerianged; to form a. known and legible symbol, when viewed et the proper :ingle relative to the smooth surface of the pipe or tube.

ln testimony whereof7 I have hereunto set my hand.

AUGUSTUS M. siinnnens.

havingn series of isi. 

